Peter Cock wrote, On 04/21/2011 12:59 PM:
> On Thu, Apr 21, 2011 at 5:43 PM, Assaf Gordon <> wrote:
>> Hi Peter,
>> Peter Cock wrote, On 04/21/2011 11:00 AM:
>>> Is there any built in way to control the Unix priority level (e.g.
>>> nice or ionice) used to run tasks? I don't see anything on here,
>>> but perhaps I'm looking in the wrong place:
>> I've been experimenting with 'nice' as well (for other servers), and it
>> seems the consensus is that 'nice' is broken.
>> Linus puts it in a colorful way here:
>> "[...] Seriously. Nobody _ever_ does "nice make", unless they are seriously
>> repressed beta-males (eg MIS people who get shouted at when they do
>> system maintenance unless they hide in dark corners and don't get
>> discovered). It just doesn't happen."
> I know nice isn't perfect, but in the case of the sys admin setting
> up Galaxy, we don't have the human laziness problem to overcome:
> We could ensure all job tasks get run with nice 10 automatically,
> without the Galaxy users having to do anything special.

The article goes to explain further why "nice" is not the best option, the 
above quote was just a jest.
But you are right that it's better than nothing.

>> One recommended solution is to use "cgroups", which can control
>> CPU, Disk I/O, Memory usage and network load, as explained here:
>> With "cgroups" there will be no need to change anything in galaxy
>> (just apply a cgroup to the galaxy user, or something similar).
> Yes, but I want to treat the Galaxy webserver differently from
> the compute jobs it launches.

I'm certain there's a way to set limits per processes, not just per users - but 
I haven't experimented with it.

>> Unfortunately, "cgroups" requires a recent kernel, so it might not
>> be applicable in your case.
> Are you using cgroups on your Galaxy?

Only on my development system - unfortunately my production serve uses CentOS 5 
with an old kernel and no cgroup support.

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